US20040011147A1 - Filter soil detecting device - Google Patents

Filter soil detecting device Download PDF

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Publication number
US20040011147A1
US20040011147A1 US10/608,675 US60867503A US2004011147A1 US 20040011147 A1 US20040011147 A1 US 20040011147A1 US 60867503 A US60867503 A US 60867503A US 2004011147 A1 US2004011147 A1 US 2004011147A1
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United States
Prior art keywords
filter
lens
diaphragm
detecting device
mark
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/608,675
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English (en)
Inventor
Yoshitaka Saida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Assigned to HONDA GIKEN KOGYO KABUSHIKI KAISHA reassignment HONDA GIKEN KOGYO KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAIDA, YOSHITAKA
Publication of US20040011147A1 publication Critical patent/US20040011147A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring

Definitions

  • the present invention relates to filter soil detecting devices for detecting clogging or soiling of filters in pneumatic equipment.
  • Filters in pneumatic equipment cannot generally be checked from outside for clogging or soiling.
  • a device attached for indicating clogging or soiling of a filter is thus usable to be soon aware of the time to replace the filter.
  • a “Clogging Detecting Device” in Japanese Patent Laid-Open Publication No. 2000-254431, for example is known.
  • a filter soil detecting device 100 includes a clogging detection shaft 103 having a permanent magnet 102 slidably fitted in a main block 101 , a primary diaphragm chamber 105 formed by attaching a primary diaphragm 104 to one end of the main block 101 , the primary diaphragm chamber 105 being connected to a primary port 107 of a filter 106 shown in FIG. 11, and a secondary diaphragm chamber 115 formed by attaching a secondary diaphragm 114 to the other end of the main block 101 , the secondary diaphragm chamber 115 being connected to a secondary port 117 of the filter 106 shown in FIG. 11.
  • the above filter soil detecting device 100 requires a large differential pressure to cause the clogging detection shaft 103 to move, and is not suitable for the detection of clogging or soiling of filters in, for example, vehicle air conditioners in which only relatively small differential pressures are formed. Specifically, it is difficult for the magnetic sensor to sense a magnetic variation in the permanent magnet 102 caused by a slight movement of the clogging detection shaft 103 . It is thus difficult to determine the state of clogging or soiling of the filter element 118 .
  • a filter soil detecting device for detecting, when a filter is soiled, decrease in pressure at a secondary side of the filter below normal value or increase in pressure at a primary side of the filter above normal value, which detecting device comprises: a chamber provided in communication with a channel at the primary side or secondary side of the filter; a lens mounted on the distal end of the chamber; a diaphragm extended in the chamber in parallel with the lens; a mark provided on the surface of the diaphragm opposite to the lens; and a vent provided between the diaphragm and the lens; in which, the diaphragm moves toward or away from the lens by pressure at the primary side or secondary side of the filter, varying the image of the mark seen through the lens from outside, thereby allowing the detection of degree of soiling of the filter.
  • the diaphragm's moving toward or away from the lens by pressure at the primary or secondary side of the filter is utilized to vary the image of the mark seen through the lens from outside, thereby to detect degree of soiling of the filter.
  • the diaphragm can quickly move under pressure at the primary or secondary side of the filter and the mark thereon can move with the movement of the diaphragm.
  • the configuration to monitor the mark though the lens allows variation in the image of the mark to be noticed even under small differential pressures.
  • the state of clogging or soiling of the filter can be easily determined and clogging or soiling of the filter can be checked under small differential pressures.
  • the chamber is preferably provided at the distal end of a connecting pipe which is connected to the channel in a diverging manner, or directly connected to the channel.
  • the direct mounting of the chamber of the filter soil detecting device to the channel can eliminate support members or the like for mounting the chamber.
  • the detecting device preferably further comprises a lens shade covering approximately half the lens.
  • a lens shade covering approximately half the lens.
  • FIG. 1 is a cross-sectional view of a pneumatic device and a filter soil detecting device according to a first embodiment of the present invention
  • FIGS. 2A, 2B and 2 C are diagrams illustrating pressures in an air channel and movements of a diaphragm when a fan is rotated at a maximum volume of air in the filter soil detecting device of the first embodiment shown in FIG. 1;
  • FIGS. 3A and 3B are diagrams illustrating difference in the look of a mark when a diaphragm is looked in at from the outside of a lens, between a state of no soiling or clogging of a filter and a state of significant soiling or clogging in the filter soil detecting device of the first embodiment shown in FIG. 1;
  • FIGS. 4A and 4B are a perspective view illustrating the appearance of the filter soil detecting device shown in FIG. 1 and a diagram illustrating a mark seen from above the lens;
  • FIGS. 5A and 5B are a perspective view illustrating the appearance of a filter soil detecting device according to a second embodiment and a diagram illustrating a mark seen from above a lens;
  • FIG. 6 is a cross-sectional view of a filter soil detecting device according to a third embodiment
  • FIG. 7 is a cross-sectional view of a filter soil detecting device according to a fourth embodiment
  • FIGS. 8A, 8B and 8 C are diagrams illustrating pressures in an air channel and movements of a diaphragm when a fan is rotated at a maximum volume of air in the filter soil detecting device of the fourth embodiment
  • FIGS. 9A and 9B are diagrams illustrating difference in the look of a mark when a diaphragm is looked in at from the outside of a lens, between a state of no soiling or clogging of a filter and a state of significant soiling or clogging in the filter soil detecting device of the fourth embodiment shown in FIG. 7;
  • FIG. 10 is a cross-sectional view of a conventional filter soil detecting device.
  • FIG. 11 is a cutaway cross-sectional view of a filter equipped with the conventional filter soil detecting device.
  • a pneumatic device 11 includes an air channel 12 for guiding air, a filter 14 provided near an inlet 13 of the air channel 12 for removing dust in the air, and a fan 16 provided near an outlet 15 of the air channel 12 for causing air flow.
  • the air channel 12 has a pressure take-off port 17 for taking the pressure of the air channel 12 between the filter 14 and the fan 16 .
  • An air inflow side 18 of the filter 14 is herein defined as a primary side of the filter 14 and an air outflow side 19 of the filter 14 is defined as a secondary side of the filter.
  • Hollow arrow Al indicates the flow of air at the primary side of the filter 14 and hollow arrow A 2 indicates the flow of air at the secondary side of the filter 14 .
  • a filter soil detecting device 20 is a device for detecting the state of soiling or clogging of the filter 14 in the pneumatic device 11 .
  • the detecting device 20 includes a connecting pipe 21 connected to the pressure take-off port 17 of the air channel 12 , a chamber 22 connected to the distal end of the connecting pipe 21 , a lens 23 mounted on the distal end of the chamber 22 , and a diaphragm 24 extended in the chamber 22 across in parallel with the lens 23 .
  • the chamber 22 has a vent 25 provided between the diaphragm 24 and the lens for maintaining atmospheric pressure therebetween.
  • the diaphragm 24 has a mark 26 provided on the surface opposite to the lens 23 .
  • the lens 23 is a convex lens.
  • FIGS. 2A, 2B and 2 C illustrate pressures in the air channel 12 and movements of the diaphragm 24 when the fan 16 is rotated at a maximum volume of air.
  • FIG. 2A illustrates a state in which no soiling or clogging of the filter 14 occurs. Pressure at the primary side of the filter 14 and pressure at the secondary side are substantially the same and have normal value. The diaphragm 24 is kept horizontal.
  • FIG. 2B illustrates a state in which some soiling or clogging of the filter 14 occurs.
  • the pressure at the secondary side of the filter 14 becomes smaller than normal value, forming a small negative pressure.
  • the diaphragm 24 slightly curves as shown by arrow b.
  • FIG. 2C illustrates a state in which significant soiling or clogging of the filter 14 occurs.
  • the pressure at the secondary side of the filter 14 further becomes smaller than normal value, forming a large negative pressure.
  • the diaphragm 24 largely curves as shown by arrow c.
  • FIGS. 3A and 3B illustrate difference in the look of the mark 26 when the diaphragm 24 is looked in at from the outside of the lens 23 , between a state of no soiling or clogging of the filter 14 (see FIG. 1) and a state of significant soiling or clogging.
  • a mark image (virtual image) H 2 is formed at the points of intersection of arrows a 2 and a 3 extended in the opposite directions. The mark 26 can thus be seen as the mark image H 2 from the outside of the lens 23 .
  • a mark image (real image) H 1 is formed at the gathering points of arrows b 2 , b 3 and b 5 .
  • the mark 26 can thus be seen as the mark image H 1 from the outside of the lens 23 .
  • the state of clogging or soiling of the filter 14 can be easily determined and clogging or soiling of the filter 14 can be checked under small differential pressures.
  • the connecting pipe 21 (see FIG. 1) is diverged from the channel 12 at the secondary side of the filter 14 , the chamber 22 is provided at the distal end of the connecting pipe 21 , the lens 23 is mounted on the distal end of the chamber 22 , the diaphragm 24 is extended in the chamber 22 in parallel with the lens 23 , the mark 26 is provided on the surface of the diaphragm 24 opposite to the lens 23 , and the vent 25 is provided between the diaphragm 24 and the lens 23 , so as to utilize the fact that the diaphragm 24 moves away from the lens 23 under the pressure at the secondary side of the filter 14 to vary the mark image (H 1 , H 2 ) seen through the lens 23 from outside, thereby to detect the degree of soiling of the filter 14 .
  • the diaphragm 24 can quickly move under the pressure at the secondary side of the filter 14 .
  • the mark 26 thereon can move with the movement of the diaphragm 24 .
  • the configuration to monitor the mark 26 through the lens 23 thus allows variation in the mark image (H 1 , H 2 ) to be noticed even under small differential pressures. As a result, the state of clogging or soiling of the filter 14 can be easily determined.
  • FIGS. 4A and 4B illustrate a perspective view and a plan view of the filter soil detecting device 20 shown in FIG. 1.
  • FIGS. 5A and 5B illustrate a filter soil detecting device according to a second embodiment.
  • a filter soil detecting device 30 in the second embodiment has substantially the same configuration as the filter soil detecting device 20 in the first embodiment shown in FIG. 1, and has a lens shade 38 covering approximately half the exterior of a lens 33 , provided on a chamber 32 .
  • a mark image (real image) H 3 as shown in FIG. 5B does not appear, it is indicated that no soiling or clogging of a filter 14 (see FIG. 1) occurs.
  • the lens shade 38 provided to cover about half the lens 33 to narrow the area for indication of soiling or clogging of the filter 14 allows quick determination of soiling or clogging of the filter 14 .
  • the visibility of the filter soil detecting device 30 can be increased.
  • FIG. 6 Components identical to those in the filter soil detecting device 20 of the first embodiment shown in FIG. 1 are affixed identical reference numerals and will not be described.
  • a filter soil detecting device 40 in the third embodiment includes a chamber 42 directly connected to a pressure take-off port 17 of an air channel 12 , a lens 42 mounted on the distal end of the chamber 42 , and a diaphragm 44 extended in the chamber 42 in parallel with the lens 43 .
  • the chamber 42 has an inlet 47 as a connecting pipe for introducing the pressure of the air channel 12 , and a vent 45 provided between the diaphragm 44 and the lens 43 for maintaining atmospheric pressure therebetween.
  • the diaphragm 44 has a mark 46 provided on the surface opposite to the lens 43 .
  • the filter soil detecting device 40 can eliminate supporting members or the like for mounting the chamber 42 by directly mounting the chamber 42 on the pressure take-off port 17 of the air channel 12 . The elimination results in reduced costs of the filter soil detecting device 40 .
  • FIGS. 7 to 9 B illustrate a filter soil detecting device according to a fourth embodiment of the present invention.
  • a pneumatic device 51 shown in FIG. 7 includes an air channel 52 for guiding air, a fan 56 provided near an inlet 53 of the air channel 52 for causing air flow, and a filter 54 provided near an outlet 55 of the air channel 52 for removing dust in the air.
  • the air channel 52 has a pressure take-off port 57 between the filter 54 and the fan 56 for taking the pressure of the air channel 52 .
  • An air inflow side 58 of the filter 54 is defined as a primary side of the filter 54 .
  • An air outflow side 59 of the filter 54 is defined as a secondary side of the filter 54 .
  • Hollow arrow B 1 indicates the flow of air at the primary side of the filter 54 .
  • Hollow arrow B 2 indicates the flow of air at the secondary side of the filter 54 .
  • the filter soil detecting device 60 includes a chamber 62 directly connected to the pressure take-off port 57 of the air channel 52 , a lens 63 mounted on the distal end of the chamber 62 , and a diaphragm 64 extended in the chamber 62 in parallel with the lens 63 .
  • the chamber 62 has an inlet 67 as a connecting pipe for introducing the pressure of the air channel 52 , and a vent 65 provided between the diaphragm 64 and the lens 63 for maintaining atmospheric pressure therebetween.
  • the diaphragm 64 has a mark 66 provided on the surface opposite to the lens 63 .
  • FIGS. 8A, 8B and 8 C illustrate pressures in the air channel 52 and movements of the diaphragm 64 when the fan 56 is rotated at a maximum volume of air in the filter soil detecting device 60 of the fourth embodiment.
  • FIG. 8A illustrates a state in which no soiling or clogging of the filter 54 occurs. Pressure at the primary side of the filter 54 and pressure at the secondary side are substantially the same and have normal value.
  • the diaphragm 64 can be kept horizontal.
  • FIG. 8B illustrates a state in which some soiling or clogging of the filter 54 occurs.
  • the pressure at the primary side of the filter 54 becomes larger than normal value, forming a small positive pressure.
  • the diaphragm 64 slightly curves as shown by arrow b.
  • FIG. 8C illustrates a state in which significant soiling or clogging of the filter 54 occurs.
  • the pressure at the primary side of the filter 54 further becomes larger than normal value, forming a large positive pressure.
  • the diaphragm 64 largely curves as shown by arrow c.
  • FIGS. 9A and 9B illustrate difference in the look of the mark 66 when the diaphragm 64 is looked in at from the outside of the lens 63 , between a state in which no soiling or clogging of the filter 54 (see FIG. 7) occurs and a state in which soiling or clogging occurs in the filter soil detecting device 60 of the fourth embodiment.
  • FIG. 9A With Fl as the object-side focal point, F 2 as the image-side focal point, C as the optical axis, R 1 as the lens principal point and R 2 as the lens principal plane, arrow a 4 indicates light coming from the mark 66 in parallel with the optical axis C into the lens 63 , arrow a 5 indicates the light of a 4 refracted at the lens principal plane R 2 toward the image-side focal point F 2 , arrow a 6 indicates light traveling from the mark 66 toward the lens principal point R 1 , arrow a 7 indicates light coming from the mark 66 through the object-side focal point Fl, and arrow a 8 indicates the light of arrow a 7 refracted at the lens principal plane R 2 to travel in parallel with the optical axis C. That is, a mark image (real image) H 5 is formed at the gathering points of arrows a 5 , a 6 and a 8 . The mark 66 can thus be seen as the mark image H 5 from the outside of the lens
  • arrow b 6 indicates light coming from the mark 66 into the lens 63 in parallel with the optical axis C
  • arrow b 7 indicates the light of arrow b 6 refracted at the lens principal plane R 2 toward the image-side focal point F 2
  • arrow b 8 indicates light coming from the mark 66 through the lens principal point R 1 . Since the mark 66 is located on the lens 63 side (inside) of the object-side focal point F 1 , the mark image (real image) H 5 as shown in FIG. 9A is not formed. A mark image (virtual image) H 6 is formed at the points of intersection of arrows b 7 and b 8 extended in the opposite directions. The mark 66 can thus be seen as the mark image H 6 from the outside of the lens 63 .
  • the filter soil detecting device 60 when the mark image H 5 can be seen, it is indicated that the filter 54 is free of soiling or clogging. When the mark image H 6 can be seen, it is indicated that the filter 54 is significantly soiled or clogged and it is the time to replace or clean the filter 54 .
  • the filter soil detecting device 60 for detecting increase in pressure at the primary side of the filter 54 above normal value when the filter 54 (see FIG. 7) is soiled, which filter soil detecting device 60 including the inlet (connecting pipe) 67 diverging from the air channel 52 (see FIG.
  • the chamber 62 provided at the distal end of the inlet 67 , the lens 63 mounted on the distal end of the chamber 62 , the diaphragm 64 extended in the chamber in parallel with the lens 63 , the mark 66 provided on the surface of the diaphragm 64 opposite to the lens 63 , and the vent 65 provided between the diaphragm 64 and the lens 63 , utilizes the fact that the diaphragm 64 moves toward the lens 63 under the pressure at the primary side of the filter 54 to vary the mark image (H 5 , H 6 ) seen through the lens 64 from outside, thereby to allow the detection of degree of soiling of the filter 54 .
  • the diaphragm 64 can quickly move under the pressure at the primary side of the filter 54 and the mark 66 thereon can move with the movement of the diaphragm 64 .
  • the configuration to monitor the mark 66 though the lens 63 allows variation in the mark image (H 5 , H 6 ) to be noticed even under small differential pressures. As a result, the state of clogging or soiling of the filter 54 can be easily determined.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Measuring Fluid Pressure (AREA)
  • Fluid-Pressure Circuits (AREA)
US10/608,675 2002-07-01 2003-06-24 Filter soil detecting device Abandoned US20040011147A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-192514 2002-07-01
JP2002192514A JP2004036699A (ja) 2002-07-01 2002-07-01 フィルタ汚れ検出装置

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JP (1) JP2004036699A (ja)
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070272082A1 (en) * 2006-05-26 2007-11-29 3M Innovative Properties Company Method and apparatus for monitoring the condition of a flexible filter
US20160094965A1 (en) * 2014-09-30 2016-03-31 At&T Intellectual Property I, L.P. Access to wireless emergency alert information via the spectrum access system
CN105909621A (zh) * 2016-06-23 2016-08-31 嘉兴三乐实业有限公司 一种可视方便更换滤芯的液压油过滤器
TWI562818B (en) * 2015-03-11 2016-12-21 Benq Corp Purifying system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005043119A (ja) 2003-07-24 2005-02-17 Honda Motor Co Ltd 圧力検出表示装置および圧力検出表示装置を用いた目詰まり検出装置
ITRE20040032A1 (it) * 2004-04-09 2004-07-09 Ufi Filters Spa Dispositivo per la segnalazione dell'intasamento del filtro carburante di motori endotermici, in particolare motore diesel
KR102269043B1 (ko) * 2014-08-05 2021-06-24 삼성전자주식회사 공기정화장치
CN113041729A (zh) * 2021-03-29 2021-06-29 广东电网有限责任公司东莞供电局 一种双通道sf6气体净化装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678881A (en) * 1970-03-27 1972-07-25 Gen Electric Device for indicating contamination of a fluid supply to a fluidic circuit
US4153003A (en) * 1974-04-22 1979-05-08 Wm. M. & Isabel Willis Filter condition indicator
US4779456A (en) * 1986-04-07 1988-10-25 Ital Idee S.R.L. An Italian Limited Liability Company Device for visually checking the degree of clogging of an air filter in motor vehicle engines
US5433762A (en) * 1993-02-25 1995-07-18 Duracraft Corporation Filtered air moving apparatus
US5575832A (en) * 1994-09-21 1996-11-19 Humidtech Research, Inc. Regenerative hygroscopic filter and method
US5845597A (en) * 1994-03-15 1998-12-08 Vista Water Systems, Inc. Separation medium efficiency indicator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678881A (en) * 1970-03-27 1972-07-25 Gen Electric Device for indicating contamination of a fluid supply to a fluidic circuit
US4153003A (en) * 1974-04-22 1979-05-08 Wm. M. & Isabel Willis Filter condition indicator
US4779456A (en) * 1986-04-07 1988-10-25 Ital Idee S.R.L. An Italian Limited Liability Company Device for visually checking the degree of clogging of an air filter in motor vehicle engines
US5433762A (en) * 1993-02-25 1995-07-18 Duracraft Corporation Filtered air moving apparatus
US5845597A (en) * 1994-03-15 1998-12-08 Vista Water Systems, Inc. Separation medium efficiency indicator
US5575832A (en) * 1994-09-21 1996-11-19 Humidtech Research, Inc. Regenerative hygroscopic filter and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070272082A1 (en) * 2006-05-26 2007-11-29 3M Innovative Properties Company Method and apparatus for monitoring the condition of a flexible filter
US7594960B2 (en) * 2006-05-26 2009-09-29 3M Innovative Properties Company Method and apparatus for monitoring the condition of a flexible filter
US20160094965A1 (en) * 2014-09-30 2016-03-31 At&T Intellectual Property I, L.P. Access to wireless emergency alert information via the spectrum access system
TWI562818B (en) * 2015-03-11 2016-12-21 Benq Corp Purifying system
CN105909621A (zh) * 2016-06-23 2016-08-31 嘉兴三乐实业有限公司 一种可视方便更换滤芯的液压油过滤器

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Publication number Publication date
JP2004036699A (ja) 2004-02-05
CN1468643A (zh) 2004-01-21

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Effective date: 20030606

STCB Information on status: application discontinuation

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